On the use of super compact scheme for spatial differencing in numerical models of the atmosphere

V Esfahanian, S Ghader, Ali Reza Mohebalhojeh

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

The 'Super Compact Finite-Difference Method' (SCFDM) is applied to spatial differencing of some prototype linear and nonlinear geophysical fluid dynamics problems. An alternative form of the SCFDM relations for spatial derivatives is derived. The sixth-order SCFDM is compared in detail with the conventional fourth-order compact and the second-order centred differencing. For the frequency of linear inertia-gravity waves on different numerical grids (Arakawa's A-E and Randall's Z) related to the Rossby adjustment process, the sixth-order SCFDM shows a substantial improvement on the conventional methods. For the Jacobians involved in vorticity advection by non-divergent flow and in the Bolin-Charney balance equation, a general framework, valid for every finite-difference method, is derived to present the discrete forms of the Jacobians. It is found that the sixth-order SCFDM provides a noticeably more accurate representation of the wave-number distribution of the Jacobians, when compared with the conventional methods. The problem of reconstructing the stream-function field from the vorticity field on a sphere is also considered. For the Rossby-Haurwitz wave, the computation of a normalized global error at different horizontal resolutions in longitude and latitude directions shows that the sixth-order SCFDM can markedly improve on the fourth-order compact. The sixth-order SCFDM is thus proposed as a viable method to improve the accuracy of finite-difference models of the atmosphere.

Original languageEnglish
Pages (from-to)2109-2129
Number of pages21
JournalQuarterly Journal of the Royal Meteorological Society
Volume131
DOIs
Publication statusPublished - Jul 2005

Keywords

  • Arakawa Jacobian
  • inertia-gravity waves
  • numerical grids
  • spherical geometry
  • super Compact Finite Difference
  • SHALLOW-WATER EQUATIONS
  • WAVES

Fingerprint

Dive into the research topics of 'On the use of super compact scheme for spatial differencing in numerical models of the atmosphere'. Together they form a unique fingerprint.

Cite this